EP0139927A2 - Bielle - Google Patents

Bielle Download PDF

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Publication number
EP0139927A2
EP0139927A2 EP84109409A EP84109409A EP0139927A2 EP 0139927 A2 EP0139927 A2 EP 0139927A2 EP 84109409 A EP84109409 A EP 84109409A EP 84109409 A EP84109409 A EP 84109409A EP 0139927 A2 EP0139927 A2 EP 0139927A2
Authority
EP
European Patent Office
Prior art keywords
connecting rod
shaft
rod according
wave
cast iron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84109409A
Other languages
German (de)
English (en)
Other versions
EP0139927A3 (fr
Inventor
Fritz Mahnig
Günter Schulte
Hans Schmitt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Georg Fischer AG filed Critical Georg Fischer AG
Publication of EP0139927A2 publication Critical patent/EP0139927A2/fr
Publication of EP0139927A3 publication Critical patent/EP0139927A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/02—Constructions of connecting-rods with constant length
    • F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like

Definitions

  • the present invention relates to a connecting rod with a large and a small bearing eye and a shaft connecting the bearing eyes.
  • the connecting rod is used to connect a reciprocating piston to the crank pin of a rotating crankshaft.
  • the connecting rod must withstand all loads during operation, i.e. it must not break. It also has to keep stiff.
  • the technical development is aimed on the one hand at saving weight, on the other hand at higher speeds and consequently at more heavily loaded connecting rods.
  • the shape, material selection and manufacturing quality must meet the increased operational requirements.
  • connecting rod shaft elongated, square or rectangular cross-sections with rounded corners, as well as oval and elliptical cross-sections.
  • Such cross-sections of the shank can often be the source of errors due to the material accumulation, which leads to the connecting rod being rejected.
  • the object of the present invention is to propose a connecting rod in which, on the one hand, weight savings are achieved by free shaping in the shaft area with the same component strength, and on the other hand a quality improvement is achieved by reducing the cavity volume.
  • Fig. 1 shows a connecting rod which consists essentially of a large bearing eye 1, a small bearing eye 2 and a shaft 3 connecting the two bearing eyes.
  • the connecting shaft has an essentially undulating cross section.
  • the wave form of the shaft consists of a wave trough 4 and a wave crest 5. These wave elements are provided along the entire shaft 3 and range from the small bearing eye 2 to the large bearing eye 1. Both the wave crest 5 and the wave trough 4 take from the small bearing eye 2 in the direction of the large bearing eye 1 in width.
  • the area 6 of the shaft 3 which transitions from the wave trough 4 to the wave crest 5 runs between the two bearing eyes in the axis of symmetry 7 of the connecting rod.
  • the wave shape in the cross section of the shaft is essentially a right-angled broken wave line, and a sinusoidal shape is also conceivable.
  • the shaft 3 has laterally extending legs 8 and 9 which connect the bearing eyes to one another.
  • the free edges 3a, 3b of the legs project diametrically away from each other.
  • the wave valleys and wave crests run out in an arc.
  • the connecting rod described is preferably produced in a casting process.
  • the proposed shape of the connecting rod shaft is particularly advantageous from a casting point of view, because material accumulations can be avoided and an essentially constant wall thickness is achieved.
  • the wave-shaped design also brings special advantages in terms of strength.
  • Cast iron with nodular graphite and pearlitic malleable cast iron are particularly suitable as materials for the production of the connecting rod described.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
EP84109409A 1983-09-06 1984-08-08 Bielle Withdrawn EP0139927A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4869/83 1983-09-06
CH486983 1983-09-06

Publications (2)

Publication Number Publication Date
EP0139927A2 true EP0139927A2 (fr) 1985-05-08
EP0139927A3 EP0139927A3 (fr) 1985-08-14

Family

ID=4283970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84109409A Withdrawn EP0139927A3 (fr) 1983-09-06 1984-08-08 Bielle

Country Status (2)

Country Link
EP (1) EP0139927A3 (fr)
ES (1) ES290701Y (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1540523A (en) * 1923-02-26 1925-06-02 Stephen D Hartog Connecting rod

Also Published As

Publication number Publication date
EP0139927A3 (fr) 1985-08-14
ES290701U (es) 1986-03-16
ES290701Y (es) 1986-10-16

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19840808

AK Designated contracting states

Designated state(s): AT DE FR GB IT

PUAL Search report despatched

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AK Designated contracting states

Designated state(s): AT DE FR GB IT

RHK1 Main classification (correction)

Ipc: F16C 7/02

17Q First examination report despatched

Effective date: 19860428

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19861022

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MAHNIG, FRITZ

Inventor name: SCHULTE, GUENTER

Inventor name: SCHMITT, HANS